Yes, I agree with EDDIE51. Nautical charts are the answer.You'll probably find you'll have to source hard copies - this is one of those occasions when the internet is not much use.
Your contact should know where to source them. If not public libraries in the nearest major towns in Norway will undoubtedly have the charts and may provide you with the information if you phone or email them.
Alternatively, you may find it easier to contact your nearest Norwegian Embassy. If you're in luck, they probably have the information on the premises. Failing that, they'll either find out for you or direct you to a resource for free.